Throttle-valve for drills



L. C. BAYLES AND F. M. SLATER.

THROTTLE VALVE FOR DRlLLS.

APPLICATION HLED OCT. 11, 1918T Patented Apr. 5, 1921.

2 SHEETS-SHEET I.

IN VEN TOR.

ATTORNEY L. c, BAYLES AND F. M. SLATER.

THROTTLE VALVE FOR DRILLS.

APPLICATION FILED OCT. 11, 1918.

v NVNTOR. o C. 1' MM M ATTORNEY Patented Apr. 5, 1921. I ,2 S HEE TS-SHEET 2.

LEWIS C. BAYLES AND FRED M. SLATER, OIE EASTON', PENNSYLVANIA, ASSIGNORS TO INGERSOLL-RAN'D COMPANY, OFJERSEY CITY, NEW JERSEY, A. CORPORATION OF NEW JERSEY.

THROTTLE-VALVE FOR DRILLS.

Specification of Letters Patent.

Patented Apr-.5, 1921.

Application filed October 11, 1918. Serial No. 257,788.

To all whom it may concern:

Be it known that. we, LEWIS C. BAYLES and FRED M. SLATER, both citizens of, the United States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented a certain new and useful Improvement in Throttle-Valves for Drills, of which the following is a specification.

This invention relates to throttle valves and especially to throttle valves adapted to be used in connection with percussive hammer drills used in rock drilling.

The objects of the present invention are to provide a throttle valve for a percussive hammer drill which has an independent motor for rotating the drill steel, which will permit the power delivered by the hammer to' be varied and also the speed of rotation of the steel to be varied throughout a wide range so that the speed of rotation may be varied while the hammer blow is maintained constant and also the hammer blow may be varied while the speed of rotation of the steel is maintained constant. This is to permita wide variation in the power delivered to each element so that different amounts of power can be supplied to either element relative to the other as is found best adapted.

to the character of ground being drilled.

A further object is'to provide a hammer drill in which rotation of the throttle handle and throttle valve to various positions permits the hammer to be used alone; that is, while the drillis not being rotated; 01'

the hammeroperated lightly and the rotation varied; or the hammer and rotation both used at about one-half power; or the rotation used at .full' power and the ham-,

Iner varied; or both elements used at full power. 4

With these and other objects in view .our invention consists in. the features of construction and operation set forth in the following specification and illustrated in the accompanying drawings, forming a part hereof, 111 which:

Figure 1 shows a percussive hammer, partly in section, showing the'throttle valve in position in the drill;

Figs. 2, 5, 8,11 and ltshow cross sec.- tions through the throttle valve and easing with the throttle in different positions, taken on the line 2-2 of Fig. 1;

Figs. 3, 6, 9, 12 and 15, cross sections through the throttle valve taken on the line F igs. 1, 7, 10, 13, and 16, cross sections through thethrottle valve taken on the line contained and rotated. The throttle valve 3 is made in the form of a-frustum of a cone ,as is usual .in this form ofthrottle valve,

the larger end having afluid pressure re-- cess from which fluid is distributed to the different elements of the drill. Closing the larger end of the opening in the valve 7 casing 2 is the valve plug 5 within which is contained the fluid nipple 6. The valve 3 at its smallerend is extended forming a 1 shank 7 to which is attached the valve the throttle valve will be better understood from a study of Figs. .2 to-16, reference will now be made to'those figures.

In Figs. 2, 3, 4:, which are sections taken on .the lines 22,. 3-3, and 44, respectively, of Flg. 1, are shown the positions of the openings. extending from the central pressure chamber 41. to the periphery of the throttle controlling the admission of fluid to the fluid consuming elements of the drill" which are in the example chosen for illustratlon, the hammer cylinder and the rotation motor. The opening also is shown for a lubricator, usually provided in this type of drill. Intercepting .the valve. recess in the casing 2 are. the passages leadingv directly to the fluid consuming elements of the tool respectively shown at 9 whichleads to the hammer cylinder, 10 which leads to the handle 8. As the action and'func tion of V rotating means, and the passage 11 which 7 leads to the cavity in which the lubricator is 7 located. The openings from the pressure recess 4 to the periphery of the valve 3. are respectively in the plane of the throttle valve 3 intercepting the passages 9, 10, 11, above referred to. In. alinementwiththe passage 9 are provided two openings of unequa-l width, respectively, .12 and 13, op-, posite each other so that when the throttle is turned to the position shown in Figs. 5, 6

and 7 the smaller opening 12 permits a limited amount of fluid topass suflicient tooperate the hammer lightly which may be varied as seen in Fig. 5 by slightly varying the position of the handle 8, and when the throttle is turned to the position shown in Fig. 14, a much larger amount may be passed, to operate the hammer at full power. The above arrangement permits a. very wide range of control over the power delivered by the hammer, as that is directly in pro portion to the amount of fluid supplied to operate it. Furthermore, the throttle 3 may be rotated somewhat without any variation in the hammer blow as when the position of the throttle is varied slightly up or down from the position shown in Fig. 8, in which position the fluid passed to the hammer cylinder is limited only by the size of the opening 12 and the amount supplied to the rotating motor varied as is evident from an inspection of Fig. 10.

Similarly, the openings provided for pass ing the fluid from the recess 4 into the rotating motor are two in number and opposite each other. One of these is shown at'14 which is a relatively small opening and at 15 1s a much larger opening subtending a valve. A V-shaped slot 16 is cut in valve 3 intercepting the opening 14 so that the amount of fluid passed through opening 14 into the rotating motor may be adjusted to a less amount than the full opening 14 would pass. (See Fig. 7.)

A single opening 19 connects the ressure recess 4 with the lubricator and, as s own in Fig. 15, this opening 19 is open when the hammer and rotating motor are on full power. In no other position of the throttle valve, however, is this opening 19 in communication with the passage 11 leading to the lubricator.

Referring now more generally to the figures, Figs. 2, 8, 4, show the position of the throttle when all elements are closed off from the supply of motive fluid.

Figs. 5, 6, 7, show the position of the throttle when the hammer alone is operating lightly. Slight variation of the throttle from this position has the effect of varying the power of the hammer from zero up to the limited power permitted through the opening 12 and a further slight movement of the throttle increases the opening to the rotation up to the capacity of part 14.

In Figs. 8, 9, 10, the-hammer is on at its limited or half power and the rotation is on very lightly, and variations from this posi tion of the throttle may increase or decrease the power supplied to the rotating motor finally brings its power up to its maximum.

This is the most usual position during the operation of the drill and so for that reason the opening 19 is open to the lubricator in this position ofthe throttle as shown in Fig. 15.

Further inspection of the figures of the drawing discloses that depression of the handle 8 from its closed position as shown in Fig. 1 serves to first admit fluid to the hammer cylinder through the opening 12 and continued movement of the handle 8 in the same direction opens communication between the opening 14 and the rotation motor so that with the handle in the position shown in Figs. 8, 9 and 10 the hammer is operated lightly and the rotation motor operated under about one half power. This position of the handle and throttle may therefore be termed the lazy or reduced power position.

If on the other hand the throttle handle 8 is raisedinstead of being depressed the rotation motor is first started as clearly shown in the Figs. 11, 12 and 13, and further rotation of the handle 8 to the posi tion shown in. Figs. 14, 15 and 16 admits full pressure fluid through the opening 13 1 operating the hammer at full power and maintains the rotation motor at full power and also opens communication between the fluid recess-4 and the lubricator. i' From the above it will be seen that a. throttle valve has been provided for percussive and rotating drills which will acco'mv moda-te the elements to any type of rock be.- ing operated upon by varyin either the; hammer or rotating motor relatively to each other, or by maintaining oneelement constant while the other is varied, or both main tained constant and at a limited power, or

both operated at full power. I

It is to be understood that the present showing and description disclose onlyfone. specific embodiment of our present invention andthat other forms and modifications are included within the spirit and scope thereof, as expressed in the appended claims.

What we claim is:

1. In a throttle valve for percussive rook cutting tools having independent percussive. and rotation elements, a valve casing, a

valve rotatable therein, said valve having ports adapted to register with fluid conduits. extending to the fluid consuming elements of the tool, rotation of said valve in one, direction being adapted: to gradually vary.

the supply to the conduit extending tothe percussive element from nothing to light operating supply, and then maintain the supply to the percussive element uniform while varying the supply to the rotation element.

2. In a throttle valve for percussive rock cutting tools having independent percussive and rotation elements, a valve casing, a valve rotatable therein, said valve having ports adapted to register with fluid conduits ex-.

tending to the fluid consuming elements of the tool, rotation of said valve in one direction being adapted to gradually vary the supply to the conduit extending to the percussive element from nothing to light operating supply, and then maintain the supply to the percussive element uniform while varying the supply to the rotation element, and rotation of said valve in the other direction being adapted to gradually open the supply to the rotation element until the supply is full open, and then maintain said supply full open, While gradually opening the supply tothe percussive element from nothing to full operating supply.

3. In a throttle valve for percussive rock cutting tools having independent percussive and rotation elements, a valve casing, a valve rotatable therein, said valve having ports adapted to register with fluid conduits extending to the fluid consuming elements of the tool, rotation of said valve in one direc-. tion being adapted to gradually vary the supply to the conduit extending to the percussive element from nothing to light operating supply, and then maintain the supply to the. percussive element uniform while varying the supply to the rotation element, and rotation of said valve in the other direction being adapted to gradually open the supply to the rotation element until the supply is full open and then maintain said supply full open, while gradually opening the supply to the percussive element from nothing to full operating supply, said valve having a port communicating with an oil supply, which port is only opened when the supply to both the percussive and rotation elements are fully open.

In testimony whereof, we have hereunto set our hands.

' LEWIS C.-BAYLES.

FRED M. SLATER; 

